Disable DIOCCACHESYNC code, which I believe does the opposite

and can cause pending IO's on wd(4) to be thrown away.  Still
trying to find a solution.

diff --git a/sys/ufs/ffs/ffs_vfsops.c b/sys/ufs/ffs/ffs_vfsops.c
index fb56e0d..15c0722 100644 (file)
--- a/sys/ufs/ffs/ffs_vfsops.c
+++ b/sys/ufs/ffs/ffs_vfsops.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: ffs_vfsops.c,v 1.167 2017/12/11 05:27:40 deraadt Exp $        */
+/*     $OpenBSD: ffs_vfsops.c,v 1.168 2017/12/11 17:13:34 deraadt Exp $        */
 /*     $NetBSD: ffs_vfsops.c,v 1.19 1996/02/09 22:22:26 christos Exp $ */
 
 /*
@@ -457,6 +457,7 @@ success:
                                fs->fs_flags &= ~FS_DOSOFTDEP;
                }
                ffs_sbupdate(ump, MNT_WAIT);
+#if 0
                if (ronly) {
                        int force = 0;
 
@@ -467,6 +468,7 @@ success:
                        VOP_IOCTL(ump->um_devvp, DIOCCACHESYNC, &force,
                            FWRITE, FSCRED, p);
                }
+#endif
        }
        return (0);